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JPS5639673A - Electric talking current supply circuit - Google Patents

Electric talking current supply circuit

Info

Publication number
JPS5639673A
JPS5639673A JP11503579A JP11503579A JPS5639673A JP S5639673 A JPS5639673 A JP S5639673A JP 11503579 A JP11503579 A JP 11503579A JP 11503579 A JP11503579 A JP 11503579A JP S5639673 A JPS5639673 A JP S5639673A
Authority
JP
Japan
Prior art keywords
scr101
circuit
exercises
telephone set
electric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11503579A
Other languages
Japanese (ja)
Other versions
JPS6236424B2 (en
Inventor
Kunio Nagashima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11503579A priority Critical patent/JPS5639673A/en
Publication of JPS5639673A publication Critical patent/JPS5639673A/en
Publication of JPS6236424B2 publication Critical patent/JPS6236424B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To prevent unrequired electric current consumption by supervising the ON-OFF state of SCR provided to a channel for electric current supply to a key telephone set. CONSTITUTION:The operation information of key telephone set 300 is transferred to the central processing circuit via line 209 and the processing circuit exercises ON- OFF control over SCR101 of channel 100 to offer switching service to telephone set 300. At this time, the conduction state of SCR101 is maintained by a DC current flowing through the path of transformer 104, current detecting circuit 304 and the +12V electric power source. Circuit 304 detects the existence of the holding current of SCR101 to exercises a supervision over the conduction of SCR101 and exercises control via OR circuit 305 so that when SCR101 turns on, switch element 301 turns off.
JP11503579A 1979-09-07 1979-09-07 Electric talking current supply circuit Granted JPS5639673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11503579A JPS5639673A (en) 1979-09-07 1979-09-07 Electric talking current supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11503579A JPS5639673A (en) 1979-09-07 1979-09-07 Electric talking current supply circuit

Publications (2)

Publication Number Publication Date
JPS5639673A true JPS5639673A (en) 1981-04-15
JPS6236424B2 JPS6236424B2 (en) 1987-08-06

Family

ID=14652585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11503579A Granted JPS5639673A (en) 1979-09-07 1979-09-07 Electric talking current supply circuit

Country Status (1)

Country Link
JP (1) JPS5639673A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763348A (en) * 1985-04-30 1988-08-09 Iwatsu Electric Co., Ltd. Controlled power supply for key telephone system
JPH03297297A (en) * 1990-04-16 1991-12-27 Nec Corp Power consumption saving system in line adaptor of multiplexer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4763348A (en) * 1985-04-30 1988-08-09 Iwatsu Electric Co., Ltd. Controlled power supply for key telephone system
JPH03297297A (en) * 1990-04-16 1991-12-27 Nec Corp Power consumption saving system in line adaptor of multiplexer

Also Published As

Publication number Publication date
JPS6236424B2 (en) 1987-08-06

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